References

Relocatable indoor pool "Aquabox" built using modular timber construction

Stuttgart, Germany

Interior view of the Aquabox in Stuttgart-Zuffenhausen

The indoor pool system "POOL out of the BOX"

The architecture of the indoor pool – featuring a 25-meter pool, five lanes, and a partial movable floor – was designed by Stuttgart-based 4a Architekten. Blumer Lehmann contributed the modules, components, and expertise in timber construction. This modular timber indoor pool system – a novel concept in Europe – offers the flexibility to be deployed at various locations. The two-story facility is currently situated at Kelterplatz in Stuttgart-Zuffenhausen, serving as an interim solution until the local indoor pool’s replacement building is completed. Subsequently, the "Aquabox" will be dismantled and reassembled at other sites in Stuttgart. Acting as the general contractor, POOL out of the BOX GmbH coordinates an established network of partners specializing in planning, architecture, timber construction, water technology, and pool construction.

All connections in modular and element construction – from screw joints to waterproof seals – have been designed so that they can be detached again. This requires precision in prefabrication, well thought-out, detailed solutions for interior finishing and building technology, and maximum coordination between statics, technology and assembly. This is especially important because the statics and load assumptions have to work reliably not just for one, but for multiple locations.

Portrait Lukas Osterwalder Division Manager Modular Construction Blumer Lehmann

Lukas Osterwalder

Division Manager Timber and Modular Construction | DE | AT | LU
Member of the Executive Board

+41 71 388 58 20
lukas.osterwalder@blumer-lehmann.com
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Interior view of the Aquabox in Stuttgart-Zuffenhausen

Modular, sustainable, deconstructible - this is what the new indoor swimming pool for Stuttgart looks like

Project details

Client:
Stuttgarter Bäder, vertreten durch Hochbauamt, Landeshauptstadt Stuttgart
Architecture:
4a Architekten
Project type:
Leisure and sport
Construction type:
Wood element construction, Modular construction
Services:
Joint GC building shell, Timber construction
Construction:
2025, 2026
Locality:
Stuttgart
Country:
Germany

Links

Exterior view of Aquabox Stuttgart-Zuffenhausen

The mobile indoor pool has been in operation since September 2026

Corridor to changing rooms Aquabox Zuffenhausen

Plenty of exposed wood and natural light create inviting spaces

Offloading of a timber module in Zuffenhausen

A prefabricated timber module is lifted onto the truck by crane and prepared for deployment on site

Timber pool assembly

CLT pool structure under construction: assembly of solid timber pool walls on site

Intersection of the load-bearing timber structure, Zuffenhausen

Precision timber joints in detail: intersection of a load-bearing timber frame with custom milled recesses in modern timber construction

Assembly of the modular pool in Zuffenhausen

Three people on site discussing the progress of a modular timber building, surrounded by scaffolding and pre-assembled timber elements

Project team POOL out of the BOX with partner companies

Joachim Maier from POOL out of the BOX and Marco Lassnig from Zeller Bäderbau (center) with exclusive partners